Light interveinal yellowing first week of flower Help needed!

Hey guys, I first saw the yellowing two days ago, on the third day of flowering. I will give you a quick rundown:

They are planted in 6L Pots in Plagron Growmix and spent 3 weeks in vegetation. 3 waterings ago I started giving them Nutes (Canna Terra Grow), and I gave them nutes every time I watered since then, because they seem hungry in my opinion. I measured the PH of every watering and always adjusted to 6.5, yesterday I watered again with nutes but on PH 6.2 to see if anything changes. Opinions please? Do you think there is already salt buildup in my medium? I really don't think that is the case, because I already saw the yellowing the second time I gave them nutes or maybe a day after that. The yellowing fan leaves feel a bit dry and scratchy on the yellow spots.
I am happy for every opinion.

what is your light source and how close? is it on all leaves? just old leaves? just new?

600W HPS that was 16 inches away, I raised it to 23 inches just now. The middle and top of the plant is most affected. But I just looked at them and maybe it is a nute burn? Take a look at this pic for example.

okcooool said:

600W HPS that was 16 inches away, I raised it to 23 inches just now. The middle and top of the plant is most affected. But I just looked at them and maybe it is a nute burn? Take a look at this pic for example.

Click to expand...

Heat stress.

yeah imo all the pics look like light/heat stress. except for the 4th picture which is a bottom leaf? looks like a potassium deficiency. not nute burn imo.

i agree with moving your light away. keep feeding plants too.

Okay i will do that thanks for the tips. Should I continue feeding next watering or give ph'ed water before I feed again since I gave them nutes 3 times in a row now?

okcooool said:

Okay i will do that thanks for the tips. Should I continue feeding next watering or give ph'ed water before I feed again since I gave them nutes 3 times in a row now?

Click to expand...

Try a little bit of bloom nutes then increase as plants progress during flowering.
Good Luck

Your girls are short on Mg...

Ok so should I water them with some magnesium and bloom nutes next time? Or are bloom nutes alone enough?

Epsom salt = Mg. I can't comment on if you need to feed 'bloom nutrients'. That my friend is your call. The Epsom salt will fix your Mg issue.

buddy.kindbot.io - diagnosis app spots signs of magnesium and potassium deficiency
try a couple photos out to narrow your search